Rock Identifier

Category

Organic Gemstone (Not A Rock Or Mineral)

Browse organic gemstone (not a rock or mineral) specimens identified by the Rock Identifier community.

Learn about Organic Gemstone (Not A Rock Or Mineral) in the encyclopedia

Rock Salt

Rock Gypsum

Coral Rock

Asphalt Rock

Calc-Silicate Rock

Calc-Silicate Rock

Talc-carbonate Rock

Talc-carbonate Rock

Sapropel

Halite

Black Shale

Bituminous Shale

Bituminous Shale

Dolomite

Gypsum

Fossiliferous Limestone (Biogenic Sedimentary Rock) — sedimentary

Fossiliferous Limestone

Biogenic Sedimentary Rock

Tiger's Eye (Pseudomorph of Quartz after Crocidolite (SiO2)) — mineral

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Fossilized ammonite fragment (Ammonoidea; likely an ammonite suture-section specimen, commonly Jurassic–Cretaceous) — fossil

Fossilized ammonite fragment

Ammonoidea; likely an ammonite suture-section specimen, commonly Jurassic–Cretaceous

Variscite (Variscite (AlPO4·2H2O)) — mineral

Variscite

Variscite (AlPO4·2H2O)

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

Amber (Fossilized plant resin; chiefly an organic polymer (succinite), not a crystalline mineral) — gemstone

Amber

Fossilized plant resin; chiefly an organic polymer (succinite), not a crystalline mineral

Fossilized bone fragment (Petrified bone, mineral-replaced vertebrate bone; exact taxon indeterminate) — fossil

Fossilized bone fragment

Petrified bone, mineral-replaced vertebrate bone; exact taxon indeterminate

Amazonite (Microcline Feldspar (KAlSi3O8)) — mineral

Amazonite

Microcline Feldspar (KAlSi3O8)

Lake Superior Agate (Banded Chalcedony (Silicon Dioxide / SiO2)) — mineral

Lake Superior Agate

Banded Chalcedony (Silicon Dioxide / SiO2)

Quartz (Agate/Chalcedony variety) (Silicon Dioxide (SiO2)) — mineral

Quartz (Agate/Chalcedony variety)

Silicon Dioxide (SiO2)

Chert (Nodule) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Nodule)

Silicon Dioxide (SiO2)

Tumbled amber (Fossilized plant resin; commonly succinite (organic polymerized resin)) — gemstone

Tumbled amber

Fossilized plant resin; commonly succinite (organic polymerized resin)

Polished amber (Fossilized tree resin; chiefly polymerized diterpenoid resin (succinite when Baltic-type)) — gemstone

Polished amber

Fossilized tree resin; chiefly polymerized diterpenoid resin (succinite when Baltic-type)

Amber (and Cubic Zirconia) (Fossilized Tree Resin) — mineraloid

Amber (and Cubic Zirconia)

Fossilized Tree Resin

Banded Chert (Ironstone type) (Silicon Dioxide (SiO2) with Iron Oxide inclusions) — sedimentary

Banded Chert (Ironstone type)

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Amber (Succinite (organic mineraloid); Chemical formula: C10H16O) — mineral

Amber

Succinite (organic mineraloid); Chemical formula: C10H16O

Septarian Nodule (Polished) (Septarian concretion (Calcite, Aragonite, Limestone)) — sedimentary

Septarian Nodule (Polished)

Septarian concretion (Calcite, Aragonite, Limestone)

Shale (Mudrock / Fissile Shale) — sedimentary

Shale

Mudrock / Fissile Shale

Chert (varietal: Flint/Jasper mix) (Hydrous Silica (SiO2)) — sedimentary

Chert (varietal: Flint/Jasper mix)

Hydrous Silica (SiO2)

Red garnet (possible almandine or pyrope), cut/polished (Garnet-group silicate; likely almandine, Fe₃Al₂(SiO₄)₃, or pyrope, Mg₃Al₂(SiO₄)₃) — gemstone

Red garnet (possible almandine or pyrope), cut/polished

Garnet-group silicate; likely almandine, Fe₃Al₂(SiO₄)₃, or pyrope, Mg₃Al₂(SiO₄)₃

Petrified Wood (Silicified Wood (Silicon Dioxide - SiO2)) — fossil

Petrified Wood

Silicified Wood (Silicon Dioxide - SiO2)

Amber-bearing rough specimen (Fossilized plant resin (amber; organic mineraloid), commonly succinite) — gemstone

Amber-bearing rough specimen

Fossilized plant resin (amber; organic mineraloid), commonly succinite

Chert / Flint (Cryptocrystalline Quartz (Silicon Dioxide, SiO2)) — sedimentary

Chert / Flint

Cryptocrystalline Quartz (Silicon Dioxide, SiO2)

Amethyst (Amethyst (Silicon Dioxide - SiO2 with iron impurities)) — mineral

Amethyst

Amethyst (Silicon Dioxide - SiO2 with iron impurities)

Chert (Green Chert) (Microcrystalline silica (SiO2)) — sedimentary

Chert (Green Chert)

Microcrystalline silica (SiO2)

Chert with Quartz Veining (Silicon Dioxide (SiO2)) — sedimentary

Chert with Quartz Veining

Silicon Dioxide (SiO2)

Chert (Chert / Flint) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Chert / Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Pearl (Pearl (Calcium Carbonate with organic conchiolin, CaCO3)) — mineral

Pearl

Pearl (Calcium Carbonate with organic conchiolin, CaCO3)

Fossiliferous Limestone (Carbonate Rock (CaCO3 with organic inclusions)) — sedimentary

Fossiliferous Limestone

Carbonate Rock (CaCO3 with organic inclusions)

Limestone with Calcite Veining (Sedimentary Carbonate Rock (CaCO3)) — sedimentary

Limestone with Calcite Veining

Sedimentary Carbonate Rock (CaCO3)

Chert Concretion (Microcrystalline Quartz (SiO2)) — sedimentary

Chert Concretion

Microcrystalline Quartz (SiO2)

Pyrite (Pyrite (FeS2)) — Mineral

Pyrite

Pyrite (FeS2)

Amber (Succinite (C10H16O)) — gemstone

Amber

Succinite (C10H16O)

Likely garnet-bearing rock (possibly almandine garnet in dark matrix) (Garnet, probably almandine (Fe₃Al₂(SiO₄)₃); host rock is not identifiable from this image) — metamorphic

Likely garnet-bearing rock (possibly almandine garnet in dark matrix)

Garnet, probably almandine (Fe₃Al₂(SiO₄)₃); host rock is not identifiable from this image

Moss Agate Sphere (Silicon Dioxide (SiO2) with inclusions) — mineral

Moss Agate Sphere

Silicon Dioxide (SiO2) with inclusions

Unidentified rough mineral fragments (Likely quartz- or feldspar-bearing rock; exact identification requires testing) — mineral

Unidentified rough mineral fragments

Likely quartz- or feldspar-bearing rock; exact identification requires testing

Chert (Jasper/Flint Pebble) (Microcrystalline quartz (SiO2)) — sedimentary

Chert (Jasper/Flint Pebble)

Microcrystalline quartz (SiO2)

Chert (Sedimentary Rock) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Sedimentary Rock)

Silicon Dioxide (SiO2)

Amber (Succinite (fossilized resin, C10H16O)) — mineral

Amber

Succinite (fossilized resin, C10H16O)

Quartz Geode (Silicon Dioxide (SiO2)) — sedimentary

Quartz Geode

Silicon Dioxide (SiO2)

Mosasaur Tooth Fossil (Mosasaurus sp.) — fossil

Mosasaur Tooth Fossil

Mosasaurus sp.

Petrified Wood (Silicified Wood (SiO2)) — fossil

Petrified Wood

Silicified Wood (SiO2)